i think that's what's gotten us thus far and hopefully that will help us continue to grow. >> reporter: now, groupon offers daily deals in 100 american cities and 29 countries. it's buying up rivals in places like japan and germany. it's on track to rake in half a billion dollars this year. unlike so many dotcom wonders, groupon is already churning a profit in its own quirky way. i'm chris bury for "nightline" in chicago. >> simple but brilliant. everybody wants to save those pennies. our thanks to chris bury for that. after the break, more silicone, this time, why the rise and possible fall of silly bands is a "sign of the times." l3l3l3l3l3l3l3l3l3l3l3l3l3l3l3l3 ♪ ♪ [ male announcer ] every business day, bank of america lends billions of dollars, to individuals, institutions, schools, organizations and businesses. ♪ working to set opportunity in motion. bank of america. working to set opportunity in motion. if they have their way, we're facing a mountain of debt and a massive tax increase. employers will continue to leave our state, taking their jobs with them. the next four ye